[edk2-devel] [PATCH v3 6/7] Platform/RaspberryPi: Power up sd, and tweak GPIOs
Jeremy Linton
jeremy.linton at arm.com
Tue Jan 5 04:35:44 UTC 2021
Hi,
On 1/4/21 12:44 PM, Philippe Mathieu-Daudé wrote:
> On 1/4/21 6:37 PM, Jeremy Linton wrote:
>> It seems we should be powering up the sd cards, and possibly
>> the clocks as well to assure they are setup properly before
>> we attempt to access the controller.
>>
>> Signed-off-by: Jeremy Linton <jeremy.linton at arm.com>
>> Reviewed-by: Andrei Warkentin <awarkentin at vmware.com>
>> ---
>> Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c | 10 ++++++++++
>> 1 file changed, 10 insertions(+)
>>
>> diff --git a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c
>> index 28f57438c5..e55ed63efa 100644
>> --- a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c
>> +++ b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c
>> @@ -552,6 +552,16 @@ ApplyVariables (
>> GpioPinFuncSet (37, GPIO_FSEL_ALT3);
>> GpioPinFuncSet (38, GPIO_FSEL_ALT3);
>> GpioPinFuncSet (39, GPIO_FSEL_ALT3);
>> +
>> + /*
>> + * power and clock everything by default
>
> Isn't this comment a bit exaggerated? You only power the minimum
> required to use the SD controller to access the card.
Maybe. Since I will be re-posting, maybe just dropping the comment is
reasonable since the code is fairly self explanatory now.
>
>> + */
>> + Status = mFwProtocol->SetPowerState (RPI_MBOX_POWER_STATE_SDHCI,
>> + TRUE, TRUE); //SD on with wait
>> + Status = mFwProtocol->SetGpioConfig (RPI_EXP_GPIO_SD_VOLT,
>> + RPI_EXP_GPIO_DIR_OUT, TRUE); //3.3v
>> + Status = mFwProtocol->SetClockState (RPI_MBOX_CLOCK_RATE_EMMC2, TRUE);
>> + Status = mFwProtocol->SetClockState (RPI_MBOX_CLOCK_RATE_EMMC, TRUE);
>> }
>> } else {
>> DEBUG ((DEBUG_ERROR, "Model Family %d not supported...\n", mModelFamily));
>>
>
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